AI think it depends on the image you would like to project for your business. I like to be casual, but I'm clean, my hair is neatly pulled back, face is on, and I carry myself well.
I'm sure you will come off more approachable (less intimidating) in a logo T-shirt and nice pants/jeans.

I think a chef's coat is a bit pretentious for a coffee shop. I wear one when I'm in my kitchen, so if I do a consult there I will wear it. Elsewhere, I just go smart casual. You still want to look professional though, so I would steer away from things like crocs.

I would go for something like dark tailored jeans and a nice but simple top, if you want a logo, I'd make it small and up on the left hand side, and nice flats.

i always make sure my hair is casual but pretty and my makeup is on. As far as clothing though, i always wear jeans, nice boots, and a simple but nice top. I look nice, but not fussy. I say classy casual is the way to go :) makes the whole consult comfortable but nice :)

Do you all feel the same for a bridal expo? Is a polo with an embroidered logo okay or would nicer attire be recommended?

For an expo where you are professionally representing your company I would recommend a chef's coat. Whenever we participated in vendor fairs (focused on gluten-free and allergy-friendly products, not weddings) my wife would wear her chef's coat and I would wear business casual attire.

Yep - same thing here Jamie - a pastry-chef is required to serve their time too - 3-4 years of on the job training which includes 1 full day per week in a school environment. Not wanting to cause friction here just bit of a bee in my bonnet about how you can now just walk into a store and purchase a jacket - don it and have people ASSUME you are qualified. Guess I think it sort of 'cheapens' the trade. ahhhhh - its the same as the gazillion people who buy a bag of icing and a packet mix and tomorrow they are selling cakes.............. grrrrr - have to forgive me it is Sunday night here! been bogged down with ridiculous emails for hours and feeling GRUMPY!!

I do think it is OVERLY simplistic to suggest that if you send food out of a kitchen you can call yourself a chef!

I agree...if you just send food out of a kitchen you are a cook. If you are responsible and accountable for the quality of the food coming out of a kitchen, you are a chef. If that food is a dessert, you are a pastry chef.